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How to simulate choppered amplifier 's noise

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lordfire

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for reducing flick noise of folded cascode amplifier, choppered with frequency 1Meg, with spectre rf simulation pss + pnoise, the output noise is as fig. a1 below shows , why not like a2 shows, is my simulation setup wrong?
 

Th simulation apparently doesn't consider chopping operation (involved frequency transformation). Any hints, that it's supposed to do?
 
I have the same problem, Can somebody help us! Thanks

Added after 4 hours 55 minutes:

hi, I got it ! I think your pnoise setting is not right!
 
Hi xiaoyanghqu,
Can u show me how to simulate the PSS & Pnoise?
How to setup?
THX
 

Please,

can somebody post something? I have the same problem and have no idea how to setup the PNOISE to get such output.

Thanks,
Oscar
 

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